Class 10 Lecture Demo

OpenStreetMap & Overpass Turbo

Class 10 Agenda:
Class 10 Agenda
Class 9 IDP Uganda Suitability submissions:
C9 Submissions
Review of Class 10 OSM Assignment:
Class 10 Assignment

Foundations of Web Mapping: The Server-Client Model

Web-based Mapping Infrastructure https://dev.solita.fi/2018/01/05/gis-services.html

OSM

QUICKOSM Plugin - ingesting OSM data within QGIS

Download the plugin(s)

QUICK OSM

Quick Map Services

Interface:

Quick OSM Interface

Key - Value combinations:

Key Value Combinations

Map Features
Overpass API Queries:

Overpass Queries within QuickOSM Plugin

OSM_ID:

OSM_ID in Quick OSM

OSM_ID in OSM

Understanding OSM ID & Changeset ID:

Changeset + ID

Changeset

Overpass Turbo - querying OSM & creating extraction

Overpass Turbo Documentation
Introduction to Overpass Turbo:
- Overpass Turbo is a web-based data filtering tool for OpenStreetMap.
- With overpass turbo you can run Overpass API queries and analyse the resulting OSM data interactively on a map. There is an integrated Wizard which helps build queries. Information on Overpass query language and protocols can be found in the OSM wiki for the API - Language Guide
The Interface features a main menu located at the top of the browser window as follows:

Overpass Turbo Interface

Important functions at the main menu include Run,Wizard, Export and Save + Load:
Run - after a query is logged into the query window located left panel, enacting this function runs the query on the OSM database and returns highlighted features if the query is successful. If the query is not sucessful, error warnings will result and can be utilized to troubleshoot the syntax of the error query.
Query Wizard - ideal location to start forming a query. Once created, the query can be enacted by Run in the query window:

Query Wizard

Once a successful query has been achieved, the results can be exported in various geospatial data formats utilizing Export:

Export Queries

Queries can also be saved and loaded from a saved state using Save and Load:

Save and Load Queries

Practice Query #1:

Using the OSM tag Tag:amenity=drinking_water, set the bounding box to a larger scale geography featuring Lower Manhattan generally. Enact Wizard and search for Drinking Water followed by build and run query:

Drinking Water Query

Practice Query #2:

OSM data is composed of 3 core Elements, essentially the building blocks of its conceptual model of the world. These are Way, Node and Relation. An overview of all the Elements is available on the OSM Wiki Elements page. In the following query, only return Way elements within the key for highway which is structured as `highway=*:

Highway + Way Query

Practice Query #3:

All queries by default are geographically bound by the map browser frame bounding box. This default can be overriden by replacing the default {{bbox}} with (lat_min, lon_min, lat_max, lon_max) as follows for any/all included Elements:

/*
This has been generated by the overpass-turbo wizard.
The original search was:
“"fire hydrant"”
*/
[out:json][timeout:25];
// gather results
(
  // query part for: “"fire hydrant"”
  node["emergency"="fire_hydrant"](40.699544,-74.020386,40.710280,-74.002876);
);
// print results
out body;
>;
out skel qt;

Practice Query #4:

Queries can also be styled. In the following, Parks are returned with specified stlying:

/*
This has been generated by the overpass-turbo wizard.
The original search was:
“leisure=playground and access!=no and access!=private”
*/
[out:json][timeout:25];
// gather results
(
  // query part for: “leisure=playground and access!=no and access!=private”
  node["leisure"="playground"]["access"!="no"]["access"!="private"]({{bbox}});
  way["leisure"="playground"]["access"!="no"]["access"!="private"]({{bbox}});
  relation["leisure"="playground"]["access"!="no"]["access"!="private"]({{bbox}});
);
// print results
out body;
>;
out skel qt;

{{style:
way{
  color: green;
  fill-color: green;
  text: name:en;
}
node{
  color: green;
  fill-color: green;
  text: name:en;
}
relation{
  color: navy;
  fill-color: green;
  text: name:en;
}
relation node, relation way, relation relation {
  color: green;
  fill-color: green;
}
}}

Practice Query #5:

The ‘everything’ Query:

[out:json][timeout:25];
(
  node({{bbox}});
  way({{bbox}});
  relation({{bbox}});
);
out body;
>;
out skel qt;

**Practice Query #6:

Returing to the original OSM Query for New York, the following Query returns explicit ID:

/*
This query looks for a node, way or relation 
with the given id.
*/
[out:json][timeout:25];
// gather results
(
  // query part for: “id:175905”
  relation(175905);
);
// print results
out body;
>;
out skel qt;